Pope Callixtus II

Pope Callixtus II (1065-13 December 1124), born Guy d'Ivrea, was Pope from 1119 to 1124, succeeding Pope Gelasius II and preceding Pope Honorius II.

Biography
Guy d'Ivrea was made Archbishop of Vienne in 1088 under Pope Urban II, and in 1119 he was elected as Pope to succeed Pope Gelasius II. In 1122 he set up the Concordat of Worms to solve the Investiture Controversy, agreeing the bishops set up by the Holy Roman Empire had secular authority but not sacred authority, as previous emperors had believed. Callixtus died in 1124.